<!DOCTYPE HTML>
<html>
    <head>
        <title>标题标签</title>
        <meta charset= 'utf-8'>

    </head>
    <body>
    <hr>
    <div style='font-size: 20px'>h1-h6是标题标签，h1最大，h6最小</div>
    <hr/>
    <div style='font-size: 20px'>代码示例</div>
    <div >
        <pre>
               &lt;h1&gt;标题标签1&lt;/h1&gt;
                &lt;h2&gt;标题标签2&lt;/h2&gt;
                &lt;h3&gt;标题标签3&lt;/h3&gt;
                &lt;h4&gt;标题标签4&lt;/h4&gt;
                &lt;h5&gt;标题标签5&lt;/h5&gt;
                &lt;h6&gt;标题标签6&lt;/h6&gt;
        </pre>
    </div>
    <hr/>
    <div style='font-size: 20px'>代码效果</div>

        <h1>标题标签1</h1>
        <h2>标题标签2</h2>
        <h3>标题标签3</h3>
        <h4>标题标签4</h4>
        <h5>标题标签5</h5>
        <h6>标题标签6</h6>

    </body>
</html>